Unusual Uptake of 131I in a Cutaneous Benign Fibrous Histiocytoma in a Patient With Thyroid Cancer

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A 52-year-old man with papillary thyroid cancer underwent total thyroidectomy and subsequent 131I remnant ablation. The postablation whole-body radioiodine scanning showed an unexpected focus on the upper right arm. SPECT/CT found that the abnormal focus of radioactivity was from body surface. Histopathology confirmed the diagnosis of benign fibrous histiocytoma.

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